Summary
The following is a description of the latest operational release of EFAS v4.8. For an overview of other EFAS releases, please see: EFAS versioning system.
Summary
EFAS v4.8 integrates changes in its meteorological forcing with the use of the new version of the ECMWF-ENS ensemble forecasting system, introduced by IFS cycle 48r1. This change in the forcing data has the following impacts on EFAS:
- Hydrological monitoring:
- No change in the observation-forced hydrological reanalysis simulations and the ECMWF-HRES-forced forecast initialisation (the so-called fill-up, where observations not yet available).
- Real time forecasts:
- The spatial resolution of the forcing increases from 18 km to 9 km for the medium-range EFAS forecasts.
- The sub-seasonal EFAS forecasts are now produced every day, instead of only twice a week for Mondays and Thursdays. The meteorological forcing comes from the new extended range forecasts in 48r1, produced every day for the 00 UTC cycle, on the same 36 km spatial resolution as before.
- Reforecasts:
- EFAS v4.8 will not have a new 48r1-specific hydrological reforecast data set.
- Seasonal forecasts and seasonal reforecasts:
- There is no impact on the seasonal hydrological modelling system.
More details on the 48r1 meteorological modelling changes can be found on the Implementation of IFS Cycle 48r1 page.
Technical details
Release date | 2023-06-27 12UTC |
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In test suite | 2022-06-05 12UTC |
EFAS internal release | 019 |
Archiving of data | ECFS, MARS, CDS |
Climatology
5 x 5 km
1 x 1 km for TAMIR products
6-hourly for medium range-monthly products, 24-hourly for seasonal
1-hourly for TAMIR products for first 6 hours lead time, 6-hourly thereafter
EFAS v4.7 enables the visualisation of the new Global Flood Monitoring (GFM) products in the CEMS EFAS map viewer. The GFM provides continuous monitoring of floods worldwide, by automatically processing and analysing in near real-time all incoming Synthetic Aperture Radar imagery acquired by the EU’s Copernicus Sentinel-1 satellites. Here is a summary of the main changes:
The GFM product is based on 3 different flood detection algorithms running in parallel and is composed by 11 different layers, roughly grouped into 4 categories: water bodies (Observed Flood Extent, Observed Water Extent, Reference Water Mask), uncertainty-related (Exclusion mask, Uncertainty values, Advisory flags), S1 data specifics (metadata, footprint, schedule) and impacts estimate (Affected population, Affected land cover).
With a spatial resolution of 20m and a revisit time ranging from 3 to 14 days depending on S-1 overpasses, the full dataset of the product output layers is made available in raster format both separately and in bulk.
The information about the specifics of the GFM products and how to access the data are provided through the GFM Product User Manual and the Product Description Document available here
Technical details
Reference climatology (for thresholds/ anomalies) | 1991-01-01 to 2017-12-31 |
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EFAS Historical | 1991-01-01 to near present |
2022-09-13 12UTC
EFAS internal release
ECFS, MARS, CDS
Horizontal projection | ETRS89 Lambert Azimuthal Equal Area Coordinate Reference System (ETRS-LAEA) |
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Horizontal resolution | 5 x 5 km 1 x 1 km for TAMIR products |
Temporal resolution | 6-hourly for medium range-monthly products, 24-hourly for seasonal 1-hourly for TAMIR products for first 6 hours lead time, 6-hourly thereafter |